I`ve just installed xampp-win32-1.8.3-1-VC11-installer.exe. Installation is succesfull but as I ran xampp I´ve got an error message as pasted below.What can be using port 80 and how to free it ?Thank you for your supportps.: op sistem is windows 8 build 6200 64 bits

12:44:13 [Apache] Problem detected!12:44:13 [Apache] Port 80 in use by "Unable to open process" with PID 4!

12:44:13 [Apache] Apache WILL NOT start without the configured ports free!12:44:13 [Apache] You need to uninstall/disable/reconfigure the blocking application12:44:13 [Apache] or reconfigure Apache and the Control Panel to listen on a different port12:44:13 [main] Starting Check-Timer12:44:13 [main] Control Panel Ready

I acessed the task manager > services to find out which pid is using what port.None seems to be employing port 80. In a 2nd attempt I opened httpd.conf and changed "ServerName localhost:" , which was 80 by default , to port 8080.Apache has not started as well.Any other suggestions ?thanks

Suggestion is to run control panel with admin privileges and it will tell you what is using port. And if you do change port (not best solution) you need to configure control panel to match and request http:// page views in browser with :8080 extension (i.e. http://localhost/index.php:8080).